The randomized subject with diagnosis of acute episode of sinusitis with symptoms and mucus in the paranasal sinuses, will treat his/her condition with background amoxicillin/clavulanate and with inhalation of Sinuclean or Saline, while the control group will not use any spray for symptom relief. Anti-histaminic, steroidal anti-inflammatory drugs are forbidden. The patient is requested to evaluate his state of symptoms by recording in a diary